GILBERT AND STAUKS — FISHES OP PA^JAMA BAY 7 



mm. 



Base of ventrals 27 



Snout to base of dorsal tin pro|)er, not including fleshy ridge 167 



Base of first dorsal c^ i 



Height of anterior margin of first dorsal (not including fleshy hump at base) 65 



Height of posterior margin 29 



Distance between dorsals 125 



Base of second dorsal 39 



Distance from second dorsal to base of upper caudal lobe 52 



Length of upper caudal lobe 1 10 



Distance from tip of caudal to base of n( itch 41 



Distance from base of notch to origin of lower lobe 75 



Distance from origin of lower caudallobe to base of anal 39 



Base of anal 26 



A specimen of Gakxs cnlifoniicus from Mag-dalena Bay, Lower California 

 (No. 1404 L. S. J. U.) compared with 31. lunulatm has the f5ns less incised and with 

 rounded angles, the snout broader and less pointed, the lips longer, about equaling 

 width of nostril, and the dorsal more backward in position, its base contained three and 

 one-fourth in its distance from snout. The angle of the mouth is also much greater. 



O. californicuti ranges to the southward along the entire coast of Lower Cali- 

 fornia and throughout the Gulf of California, where it is found associated with 

 M. lunulatus. It occurs doubtless at Mazatlan, although it has not yet been recorded 

 from that point. It was obtained by the "Albatross" in 1889 at San Quentin and 

 Magdalena bays on the outer coast of Lower California, and in Concepcion Bay, San 

 Luis Gonzales Bay, and at Station 3026 in the Gulf of California. The tVetuses 

 reported from Guaymas by Evermann and Jenkins (1891, p. 129), under the name 

 of Galeus dorsalis, belonged to G. californicus, as is sufficiently evident from their 

 measurements. 



3. Galeus dorsalis Gill. 



Plate I, Fir:. 2. 



Previous diagnoses have called attention to the low, comparatively little-incised 

 fins, and the short caudal. More conspicuous differences are found in the small size 

 of the eye, the large spiracle, and the large nostrils. The diameter of the eye is 

 contained 2g to 3 times in the distance from tip of snout to front of upper jaw. In 

 M. lunulatus of the same size, it is contained twice in this distance. The width 

 of the internasal septum is less than the distance from inner angle of nostrils to 

 margin of snout, while greater than this distance in M. lunulatus. The spiracle is a 

 long slit, I or more than I diameter of eye. The nasal valve is smaller than in 

 related species, produced mesially into a narrow flaji, the width of which does not 

 exceed \ width of nostril. The inner folds are also much simpler and smallei', and 

 fail to conceal the olfactory membrane. The snout is narrower and sharper, with 

 the outlines less curved; it is also thinner, so as to appear whitish-translucent. The 

 pores on snout are much more conspicuous than in related species, and contribute to 

 give it a spongy texture; they are numerous on top and sides of snout as well as 

 below, and are clustered to form a conspicuous patch below front of eye. The 

 shagreen is much coarser than in M. lunulatus. 



